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For nearly two generations, no American has been obligated to join up, and few do. Less than 0.5 percent of the population serves in the armed forces, compared with more than 12 percent during World War II. Even fewer of the privileged and powerful shoulder arms. In 1975, 70 percent of members of Congress had some military service; today, just 20 percent do, and only a handful of their children are in uniform.

In sharp contrast, so many officers have sons and daughters serving that they speak, with pride and anxiety, about war as a “family business.” Here are the makings of a self-perpetuating military caste, sharply segregated from the larger society and with its enlisted ranks disproportionately recruited from the disadvantaged. History suggests that such scenarios don’t end well.